Check the proton database. Most games you're thinking of work just fine.
https://old.reddit.com/r/linux_gaming/
GloriousEggroll is a Red Hat employee who works on the proton compatibility layer full time. He typically posts his progress on Twitter and will have world first screenshots of certain games working. His Twitter is a good resource.
Epic hasn't even enabled it for Fortnite, and UE5 definitely should enable fairly seamless Vulkan usage on other platforms (although the reasoning could be because the market is so small and Fortnite's QA team is already stretched incredibly thin)
Do you know any recent articles or blog posts summarizing the state of affairs with competitive multiplayer games rn?